| 释义 | 
		phthalic acid \ˈthalik-, ˈthālik-\ noun Etymology: phthalic International Scientific Vocabulary, short for naphthalic (in naphthalic acid)  : any of three isomeric dicarboxylic acids C6H4(COOH)2 obtained by oxidation of various benzene derivatives:  a.  : a crystalline acid made usually by hydration of phthalic anhydride that regenerates the anhydride on heating and is used chiefly in making esters, benzoic acid, dyes, and intermediates; ortho-benzene-dicarboxylic acid  b.  : isophthalic acid  c.  : terephthalic acid |